Another Spectra user here! Key to excellent reception-especially low band-is to ensure a solid metal to metal mechanical ground from the mount to the vehicle body, at least where there is metal. Mine is mounted passenger side trunk mount. Like y'all, I get some inquiring looks but that's it. Using a Yaesu VR 500 and a AOR 8200MKIII. Sometimes I swap it out with a Larsen 2/440 dual band and although a nice performing antenna, I eventually return to the Spectra. I'd like to get the ground plane mounting kit for home use but find Austin's street price too high.
Anyway, excellent product and be careful of the fragile inner contact.